Overview: CN3086 is a three-cell NiMH battery charge management integrated circuit that can be powered by solar energy. The device includes power transistors internally, eliminating the need for external current sensing resistors and current limiting diodes. The internal adaptive charging current module automatically adjusts the charging current based on the input power's current output capability. Users do not need to consider worst-case scenarios, maximizing the utilization of the input power's current output capability. This makes it ideal for applications powered by power sources with limited current output capabilities, such as solar panels. CN3086 requires very few external components, making it suitable for portable applications. The thermal modulation circuit controls the chip temperature around 132℃ to prevent overheating when the device's power consumption is high or the ambient temperature is high. CN3086's constant voltage charging voltage varies with battery temperature, making it suitable for NiMH battery characteristics. The charging current is set by an external resistor, with a minimum constant current charging current as low as 3 mA, making it suitable for charging small-capacity batteries. When the input voltage is cut off, CN3086 automatically enters a low-power sleep mode, with a battery current of less than 3 μA. Other functions include input undervoltage latch, automatic recharging, JEITA-compliant battery temperature monitoring, overcurrent protection during charging, and charging status indication. CN3086 is packaged in a 6-pin SOT23 package.

Product Parameters

Main Functions: 400mA solar-powered three-section NiMH battery charging management integrated circuit

Operating Mode: Linear

Battery Type: Nickel-Metal Hydride (NiMH) Battery

Number of Batteries: 3

Input Voltage: 4.5V-6V

Output Voltage Range: 4.2V

Maximum Charging Current: 400mA

Maximum Output Current: 400mA

Operating Current: 390uA

Solar Power Supply: Yes

Thermal Modulation: Yes

Package Type: SOT23-6

Chip Enable: No

Built-in Power Transistor: Yes

Applications:

l Medical Instruments

l Beauty and Skin Care Instruments

l Solar Chargers

l Portable Devices

l Various Independent Chargers

Features:

l Input Voltage Range: 4.5V to 6V

l Internally integrated charging current adaptive module, which can automatically adjust the charging current according to the current output capability of the input voltage source

l Can be powered by voltage sources with limited current output capability, such as solar panels

l Constant Voltage Charging Voltage: 4.2V ±1% (Battery Temperature 25°C)

l Constant voltage charging voltage can change with battery temperature

l Settable continuous constant current charging current up to 400mA

l Settable minimum constant current charging current as low as 3mA

l Overcurrent protection function during charging prevents damage from short circuits or incorrect use of abnormally small resistors on the ISET pin

l Charging process ends by timer in constant voltage mode

l Internal soft-start circuit

l Trickle charging mode is used when the battery voltage is low to activate deeply discharged batteries and reduce power consumption

l Charging using constant current/constant voltage/constant temperature mode maximizes charging current while preventing chip overheating

l Automatically enters low-power sleep mode when the power supply voltage is cut off

l Status indication output

l Automatic recharging

l Battery temperature monitoring function compliant with JEITA standard

l Package Type: SOT23-6

l Lead-free product, RoHS compliant, halogen-free